Reply to "roush motorsport single palne intake"

> Will this intake fit the iron 4v d1ae heads and what would the advantage over
> the aluminum holley dual plane one I have on my car now. I have the comp cam
> roller rocker cam package and I'm assuming trw 10:1 or so pistons and a hall
> big bore system. Whatcha think?

Holley does not make an aluminum dual plane intake for the 351C. They only
made small port single planes (Street Dominator) and large port single planes
(Strip Dominator). What intake do you currenlty have installed, what are the
cam specs and what is your carb?

The intake pictured appears to be a Roush casting blank for C302 heads. If it
has the 351C end seal shape (curves in towards the middle of the intake), it
is a casting blank for an A331 and would be for a 9.2" deck 351C block. If it
has the 351W end seal shape (curves out), then it's a casting blank for an A351
or a B351. To make it an A351 for a 351W style 9.5" deck block, you would simply
drill the holes. To make it a B351, you would drill the holes and mill the
port faces for a 9.2" deck block. If you run it one a race block, you'd leave
the end seal part as it is. If your run it on a Cleveland block you trim it
to match the 351C end seal (or just leave it overhang). This picture shows
the dual end seal shapes:

http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...C351_bottom.jpg.html

A couple pictures of my Roush A351/B351 casting blank:

http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...lank_bottom.jpg.html
http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...nk_side_top.jpg.html

> For comparison here is the Edelbrock version of the A331 intake, which is
> basically a Torker with A3 sized runners. Notice the runners are wider,
> giving them a "squarish" shape.

With milling and drilling, the A351 casting blank should fit a 351C but may
not seal off the lower portion of the 4V head ports (assuming you aren't
running the Roush type port stuffers). I ran into that problem attempting
to dyno test the Torker and Edelbrock A331 pictured above. Even though they
look alike, those two intakes are separate castings and there wasn't enough
material on the Edelbrock A331 to seal off the bottom of the 4V head ports.
The Roush intakes have more material there but I'm not sure if it is enough.
If you are serious about this, I can mock up a 351C block with 4V heads and
do a trial fit.

> The part number is stamped, not cast

A351's and B351's were that way since they shared a common casting, as were
C351's and D351's for the same reason. However, both of the A331's I owned
had cast in part numbers:

http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...ort_A331_01.jpg.html

If you compare the lip thickness at the port face of your A331 with mine:

http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...ort_A331_02.jpg.html

it appears to me your intake is a B351 with the end seal trimmed to fit a
Cleveland end seal. That makes it pretty much an A331 even if started life
as a different (A351/B351) casting.

> I think this is the A341 intake manifold.

Did you mean A351? I've never seen an A341 intake.

Dan Jones